Concentrating-table



C. W. WRiGHT.

CONCENTRATING TABLE.

APPLICATION FILED JULY 23,1915.

1 336 321 Patented Apr. 6, 192 93 4 Z SHEETS-SHEET lmmsm C. W. WRIGHT.

CONCENTRATING TABLE. APPLICATION FILED JULY 23,1915.

Patented Apr. 6, 1920.

2 SHEETSSHEET 2 lwuwbaz (fl/Mommy barren s rnrns PATENT ornioa.

CHARLES \VILLIAM WRIGHT, OF WASHINGTON, DISTRICT OF COLUMBIA.

CONCENTRATING-TABLE.

Application filed July 23,

To all whom it may concern:

Be it known that I, CHARLES l/VILLIAM VRIGHT, a citizen of the UnitedStates, residing at lVashington, in the District of Columbia, haveinvented certain new and useful Improvements in Concentrating-Tables, ofwhich the following is a specification.

My invention relates to tables used for concentrating ores and is moreparticularly designed to provide a table adapted not only to separatethe gangue from the metalliferous minerals, but also to separate suchminerals from each other.

It also relates to certain structural features of such tables, wherebythere is obtained simplicity and strength of construction, as well as aready adaptability or adjustment to varying conditions and classes ofmaterials to be treated.

In the accompanying drawings:

Figure l is a plan view of the bottom of the table;

i Fig. 2 is a plan view of the table;

Fig. 3 is a side elevation;

Fig. 4 is an end elevation partly in section;

Fig. 5 is a detail view of tilting device on the table; and

Fig. 6 is a detail of one of the supports.

The details of the construction are shown in the accompanying drawings.The rectangular frame is made of U-irons c, mm. high by 40 mm. wide, andtwo longitudinal U-bars Z). Small angle-irons cl placed diagonallyacross each corner are bolted to the frame to give rigidity. Largeangle-irons 0 constitute the transverse mem bers of the frame and tothese the supports and tilting device are attached. An iron rod or bolt6 passes longitudinally through the center of the frame and serves toclamp the entire frame rigidly together. The end of this rod extendsbeyond the end of the table and to it the head motion is attached. Thiscentral longitudinal member of the table is important as it distributesthe pull of the head motion over the entire length of the table and alsoacts as a pivot for tilting the table on its supports. The table top ismade of l-inch boards f spaced of an inch apart to allow for swelling.These boards are screwed to four longitudinal stringers g of pitch-pinewhich are bolted to the U-irons. There are six flexible supports 29 forthe table 30 cm. wide with Specification of Letters Patent.

1915. Serial No. 41,429.

notches p at the top in which the central rod rests. These supports arebolted to the transverse angle-irons c of the frame and to angle-ironplates 1* bolted to the foundation beam 20.

Another feature of the table is the tilting-device which consists of adouble wedge a inserted between the two central supports of the table.This is entirely carried by the table top and thus a tilting frame, orrods connecting with the foundation, or other complicated devices areeliminated.

The bars Z), Z) rest on the upper face of the double wedge, while thelower wedge surfaces rest on bolts 6, t, carried by the supports p, 1),these bolts passing through slots 8, s, in the vertical web of the anglebars 0, c.

To adjust the table the bolts t, t, at the top of the supports 19 shouldbe loosened slightly and when the table is adjusted these should betightened again. The adjustment is effected by rotating the rod 41,secured at its inner end to the wedge a, this rod having near its outerend screw-threads engaging a nut 10. secured to the frame a of thetable. A handle w is secured to the end of the rod 01. By moving thewedge, the table can be given the desired inclination. As the centralmember or rod passing through the center of the table is pivoted in thegrooves of the central supports and the end of this rod is suitablyconnected with the head motion, the table may be tilted to any desiredextent without affecting the driving mechanism or the supports.

The feed trough consists of a band of sheet iron 1 bent to form thefront and side of the trough which is about 1 meter long and 8centimeters wide. The back of the trough is the back board of the table,and the bottom of the trough is the surface of the table which however,within this inclosure, is raised toward the back by the insertion of awedge-shaped strip of wood 2 under the linoleum. The distribution of thefeed onto the table is through a row of small holes 3 at or near thebottom of front side of the trough. To check the flow of the water inthe feed as it enters the trough and to cause a classification of thematerial in the feed, severalsmall screens 4 are secured in the troughat rightangles to the sides. The best results are obtained when the topsof these screens are inclined toward the feed entrance. From this typeof feed trough the coarse ore is discharged through holes nearest thehead of the table and the slimes nearest the concentrate end. lVashwater is supplied through the pipe m, and n is a stanchion forsupporting the end of the pipe m.

The upper surface of the table is covered with linoleum on the surfaceof which parallel riflies are attached or grooves are out. Any shapedriiiie or groove may be used, though these should be tapered to zerotoward the concentrate end and terminated so that their terminationpoints on the upper half of the table form a diagonal line and those onthe lower half of the table term a convex curve relative to the lowerside of the table. The advantage of this arrangement of the riiiles isto cause a more perfect separation of the concentrates from the middlingproduct of the table.

In the treatment of ores on a concentrating table the middling productinvariably forms a band which follows the points 0t termination of theritlles and it these terminate in a diagonal line a portion of theconcentrate is dragged along under the mid dlings and discharged with itoil the table. The terminating of the lower rifiles on the table in theform of: a curve so as to carry the middlings more rapidly down thetable, allows the concentrate to throw out from under the middlings anddischarge oil the concentrate end; which is not the case on tables whereonly the diagonal line of termination of riflles is used.

My invention has in practice been used for the concentration of orescontaining galena and blende, and I have found that by arranging theends of the rifiles in the manner shown, a practically clean separa'tion of galena from blende, and particularly of blende from middlings,can be obtained. The dotted lines A, B roughly indicate the limits ofthe area of the dressing zone over which the galena travels; the linesB, 0,

that over which the blende travels; and U, D, the general course of themiddlings.

I claim 1- l. A concentrating table on the surface of which the riftlesare terminated so as to form a diagonal substantially straight line overthe upper half of the table and a convex curved line relative to thelower side of the table over the lower half of the table, the straightand curved lines of termination or" the riiiles together forming aconvex line, the table having a dressing zone upon which all of theritlles open.

2. A concentrating table on the surface of which the riilles areterminated so as to form a diagonal substantially straight line over theupper half of the table and a convex curved line relative to the lowerside of the table over the lower half of the table, the curved lineextending to the lower edge of the table, the straight and curved linesof termination of the ritlles together forming a convex line, the tablehaving a dressing zone upon which all of the riffles open.

3. A concentrating table having a feed trough secured to same,perforated screen partitions extending across said trough to check theflow of the feed into same and to cause a settling of the coarsematerial at the head of the trough and of the finer material at theopposite end of the trough, the trough having small holes in its frontside through which material is discharged onto the table.

l. A concentrating table, resilient sup porting devices to which saidtable is pivotally secured, spaced bars carried by said resilientdevices, and located on each side of the center line of the table, adoublewedge between said bars and the bottom of the table, means carriedby the table for moving said wedge to adjust the inclination of thetable, and means for clamping the table in its adjusted position.

In testimony whereof l atlix my signature.

CHARLES WILLIAM WRIGHT.

